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Topic: "guest" helmet sizing? (Read 428 times)

I know that there is no substitute for a properly fitted helmet, but at what point is "close" no longer better than "none"?

I would like to get an extra helmet to have on hand for when somebody wants to ride on my bike with me, and I can't see carrying a collection of every size helmet around with me just in case. I know too small might be uncomfortable, but I'm not talking about all-day rides, just quick jaunts. I also know too big can fly right off in a pinch and be useless...

Is there an average size that would be most likely to fit any random person trying one on? What do you guys/gals do?

I bought a small (half-head) XL to carry with me (bungeed to the rear seat or clipped to my saddlebag) on trips when I might have to carry an impromptu passenger a short distance. XL because most people I know have large heads.

There happens to be a spare full-face L helmet at my work (abandoned by some previous employee) that's at my disposal.